Mikey,

Was this a long term fix for your problem?

 

Yes.
They stripped the parking brakes cleaned and regreased the cable
They replaced one rear caliper, cleaned and reseated all the pads on all four corners.
Worked a treat.

 

AML put out SB-06-0344 on 8 November 2011 titled Recommended Brake Maintenance Procedures. You can find it here:
http://tinyurl.com/recommendebrakeprocedures

It offers a two-step solution. First is the shims you all know about. Second is slathering the back side of the pads with TUNAP micrologic® PREMIUM 113 Brake Care+ brake goo:
http://www.tunap.com/en/ranges/autom...ucts/p113.html

I went looking for this stuff at the local car parts store, and the closest goo I could find was CRC's 05016 Disc Brake Quiet:<http://crcindustries.com/auto/?s=05016

The fine print for the CRC product says, "For use on the back of non-shimmed disc pads", so I wouldn't advocate using that product as a substitute.

SB-06-0344 suggests the use of brake shim pack with p/n 4G43-28-10789. I quick Google search of that p/n suggested it may be a Jaguar part number, but a call to the parts guy at my local Jag dealer proved otherwise. If one of you can source that pack from other than AML, please let us know.